Select fire gun assembly and electronic module for underground j

Details Select fire gun assembly and electronic module for underground j Select fire gun assembly and electronic module for underground j

1995-05-10

1996-07-02

Nelson, Peter A.

Ammunition and explosives

Blasting

Patterned blasting

102313, 10220212, F42B 300

Patent

active

055311644

ABSTRACT:
A select fire gun assembly for jet perforating includes a plurality of shaped charges capable of being detonated by blasting caps activated by passage of current through the cap. The first electric terminal of the blasting cap on the bottom of the assembly is grounded. The remaining blasting caps are electrically connected to a dart that grounds only after the charge below has been detonated. The other terminal of each blasting cap is connected to the logging cable through a first diode, and these diodes are arranged in sequentially alternating polarity. The first terminal of each cap is also connected electrically through a large resistor to the gate of an electronic switch which is closed either by positive or negative voltage, depending on the nature of the switch. The switch is open when the gate is grounded. The electronic switch is incorporated in series with the logging cable. Positive and negative gated electronic switches are connected to the blasting caps in alternative sequence. A second diode is placed in series with the logging cable and parallel with the electronic switch that is associated with each blasting cap. The first and second diodes are arranged in opposite polarity to one another, and the electronic switch is in opposite polarity with the corresponding second diode. The diodes, electronic switch and the resistor for each cap is incorporated in an electronic module, the lead wires of which are mounted to the logging cable, blasting cap and the dart.

REFERENCES:
patent: 5105742 (1992-04-01), Sumner
patent: 5322019 (1994-06-01), Hyland
patent: 5355802 (1994-10-01), Petitjean
patent: 5359935 (1994-11-01), Willett

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